Round Test for Ammo

Take a cake pan with a smooth inside bottom surface, tilt it slightly, and then
pour your BB's into the high end. The ones that roll all the way down to the
bottom are "within spec." Toss the others. -Rob

BB Information

It turns out that BBs are really not 0.177 in size, at least not the ones sold
at K-Mart and Wal-Mart. I heve found that Crossman Copperheads are of extremely
low quality. Daisy Premium Zinc coated BBs appear to be of good quality and
uniform size, but are still somewhere in the 0.168" range and that's being a
little generous. By all reports 3/16" ball bearings are much more uniform in
size, generally within one thousandth of what supposed to be.

The term BB comes from "Ball Bearing". BB is an official US Caliber referred to
as .177" or 4.5mm. The real maximum diameter is .175" and the minimum diameter is
.162" with the average BB being about .173" and weighing 5.3grains. Steel shot
should not be used in rifled barrels.

I contacted a few manufactures and got the information below:

Daisy Says that their Precision Max BB's (515) specs are .173.5-.175.5, this is way off from what my cheap caplier says, but it is a cheap plastic caplier.
I'm wating for comment on their AVANTI line of BBs.
Chief AJ uses AVANTI Precision Ground Shot and shots paintball's and asprin tablets in flight. Not all the pictures load:http://www.chiefaj.com/indian_daisy.htm

Umarex USA makes RWS Match Grade BB's $6/1500 $16/5000http://www.umarexusa.com/product/RWS-BBs,58,20.htm
They say they have very lilttle variation from .177ca and are the most consistent steel BB's on the market.
I've been unable to find a local store that carries them. They do sell to Big 5, I wonder if the local store could order some for me from their where house.
"We sell to Big 5, Gander Mtn, Cabelas, Bass Pro Shop, Sports Authority, Dick's Sporting goods and K-Mart."